Improvement in molding circular and undercut work



UNITED STATES PATENT OFFICE.

VILLIAMSELLERS AND JAMES VALKER, OF CINCINNATI, OHIO.

IMPROVEMENT IN MOLDING CIRCULAR AND UNDERCUT WORK.

Specification forming part of Letters Patent No. l 3.625, dated October2, 1855.

.To all whom it may concern,.-

Beit known that we, WILLIAM SELLERS and JAMES VALKEE, of Cincinnati, inthe county of Hamilton and State of Ohio, have invented an Improvementin Molding Circular and Undercut Vork; and we do hereby declare that thefollowing is a full, clear, and

exact description of the principle or eharacter which dist-inguishesitfrom all other things before known, and ofthe usual manner ot' making,modifying, and using the same, reference being had to the accompanyingdrawings, of Whichmolding, the casting7 and the subsequent finishingoperations.

The difiiculties oi' casting undercut or grooved Work are such thatfounders generally prefer to cast solid, where the work is small andcircular, and turn out the grooves in a lathe. By our mode we can makewith ease any number of grooves in such work, and not only effect agreat saving of time and la bor, but a great savingof material. Ourmodeis as' follows: Ve attach to a mandrel or axis, A, a suitable number ofhalf-patterns, B B, &o., and mount the axis so as to revolve thehalipattern in the sand, as shown in Figs. 1, 2, and 8. Then the sandhas been properly packed about the patterns, they are brought slowly outof the sand by revolving the axis,

and thus one halt' of thc mold is made. The

other halt` being made in a similar manner, the casting will be doublethe half-patterns, and ready to be put into the ylathe to be finishedoff.

Vhat we claim as our invention is- The method of molding circularundercut work herein described.

WILLIAM SELLERS. JAMES VALKER. .Vitnesses:

T. CAMPBELL, CIIAs. G. PAG-E.

